Year	% of cohort
1972	91.3949966430664
1973	96.2453918457031
1974	95.1626434326172
1976	58.7216796875
1979	97.0048217773438
1981	95.7311935424805
1982	95.0706100463867
1983	92.2786407470703
1984	92.1999282836914
1985	91.3203277587891
1986	90.0360717773438
1994	99.3632888793945
1996	96.925407409668
1998	91.1965026855469
1999	95.1498565673828
2000	94.5432205200195
2001	97.5565490722656
2002	98.8446731567383
2003	98.9586334228516
2009	95.9736862182617
2011	95.1786880493164
2012	96.0192031860352
2015	95.5419006347656
2016	86.0947875976562
2018	92.6308212280273
2020	91.6363525390625